Renewable shell for crusher rolls



Aug. 25, 1942.

E. C.-STROM! ER RENEWABLE SHELL FOR CRUSHER ROLLS Filed May 10,, 1941 gwua/wkw. EZwzer 6 'Ahwmex tluv Patented Aug. 25, 1942 '5 UNITED STATES PATENT QFFICE RENEWABLE SHELL FOR CRUSHER ROLLS Elmer C. Stromer, Aurora, Colo.

Application May 10, 1941, Serial No. 392,868

1 Claim.

This invention relates to a rock crusher roll. The cylindrical surfaces of rock crusher rolls which contact the rock quickly wear away, and become indented and grooved so they can no longer produce a uniform product. As a result the crusher must be dismantled and the rolls discarded and replaced.

The principal object of this invention is to pro- Vide a crusher roll with a renewable grinding surface so that it will not be necessary to discard and renew the entire roll when the grinding surface becomes worn.

Another object of the invention is to provide a renewable shell for grinding rolls which can be quickly and easily placed into position on the roll without it being necessary to dismantle the crusher; which will be held from shifting or moving when in use; and which will automatically tighten itself upon the roll during use.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side elevation of the improved crusher roll;

Fig. 2 is an end view thereof with the retaining ring removed;

Fig. 3 is an end view of the removable shell as it would appear with the roll;

Fig. 4 is a longitudinal section through the improved roll;

Fig. 5 illustrates a section of the split retaining ring employed for holding the renewable shell in place; and

Fig. 6 is an enlarged, fragmentary detail sec-' tion through the retaining ring and the adjacent roll parts.

The invention comprises a roll hub ID from which roll shafts H oppositely project. The roll hub I0 is provided at one extremity with a dovetailed flange l2 projecting above the cylindrical surface thereof. An annular, V-shaped groove I3 is cut in the other end of the hub adjacent the periphery thereof. A plurality of spacedapart, longitudinally extending, half round grooves I4 are formed in the cylindrical surface of the hub Ill. These grooves align with bolt holes through the flange I2.

The renewable shell is formed in two similar half sections !5 and It, each section defining half of a cylinder. The inner surfaces of the two sections are set back from the extremities there- 'offto form shoulders and these shoulders are under-cut to form annular dovetailed grooves l1 which are inset from the extremities of the sections. The inner surfaces of the sections contain longitudinally extending grooves l8 corresponding in size, position and spacing to the grooves I4 in the hub l0.

In assembling the improved roll, the two half sections of the shell l5 and I6 are placed around the hub l0 and then are forced toward the flange I2 so that the dovetail of the flange will engage the dovetail groove ll of the shell. The sections are placed on the roll so that the grooves l8 align with the grooves l4 so as to define longitudinally extending bolt passages.

The sections are held in place on the hub by means of a split retaining ring which is formed of two arcuate, semi-circular ring sections I9, as shown in Fig. 5. The ring sections are provided with bolt openings 20 spaced similarly to the grooves 14 and I8. The inner surfaces of the ring sections are medially grooved to form two arcuate projecting edges 2|. The two ring sections are placed against the adjoining hub and shell sections with the two arcuate edges 2| engaging in the V-shaped groove l3 in the hub and the groove IT in the shell sections, as shown in Fig. 6.

Bolts 22 are then inserted through the flange I2, through the coacting grooves I4 and I8, and through the bolt openings 2!] in the ring sections l9. Nuts 23 are tightened on the bolts to firmly clamp the ring section into the coacting grooves and to firmly clamp the shell sections against the flange l2. The inclined surfaces of the dovetailed grooves act to draw the shell sections toward the hub Ill as the bolts are tightened.

It is desired to call attention to the fact that it is not necessary to remove the improved rolls from the crusher mechanism in order to renew the grinding surfaces thereof. The half sections of the shell can be placed on the hub while the roll shafts II are in position in their bearing boxes. The ring sections I9 can be positioned around the shaft ll while the latter is still in place. The position of the two ring sections on the roll is not important since they will accomplish their clamping and locking function in any position. It has been found best to have the bolts 22 in place in their grooves I4 when the shell sections are put in place to accurately locate the latter.

It will be noted that the extremities of the sections [5 and 16 project over the heads of the bolts 22 and over the nuts 23 to prevent damage thereto. It will also be noted that the bolts serve as keys to prevent rotation of the shell sections on the hub since they project equally into both members.

It has been found in actual use that the shell sections remain permanently tight. It has also been found that if the two shell sections are not in tight contact, partially powdered rock will crowd between the adjacent ends of the sections and serve to wedge the two sections tightly against the outer surfaces of the locking grooves to maintain the shell sections absolutely tight from vibrations.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claim, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A crusher roll comprising: a cylindrical hub; an annular flange projecting outwardly from the cylindrical surface of said hub at one extremity of the latter; a first dove-tailed groove formed in the inner face of said flange entirely around said hub; two semi-cylindrical shell sections surrounding and lying against said hub; a second arcuate dove-tailed groove formed in one extremity of both shell sections and interlocking with the first dove-tailed groove in said flange; a third arcuate dove-tailed groove formed in the opposite extremities of both shell sections; a fourth arcuate, dove-tailed groove formed in the other extremity of said hub, said third and fourth grooves being immediately adjacent the joint between the hub and the sections so that the adjacent sides of the grooves form a concentric annular ridge at the joining line of said joint; a pair of similar semi-circular retaining members, each having an arcuate groove, the arcuate grooves in the retaining members receiving the annular ridge at the joining line; and a concentric series of clamp b01ts extending through said flange, between the shell sections and the hub and through the retaining members to clamp the latter in place, the joining line between the shell sections and the hub forming the bolt circle for said bolts so that the latter project equally into the hub and into the shell sections to prevent the latter from rotating on the former.

ELMER C. STROMER. 

